It's a Kind of Magic contains 110 cards, including a new card type: Spells. When included in the game, Spells replace Defense, Units, or both.

1 new Building (Sorceress Tower)
4 new Units (Shaman, Sorceress, Dreki, and Dreki Eggs)
6 new Spells (Shield, Thunder, Magic Manipulation, Ice Trap, Magic Potion, and Gold Touch)
1 new Divine Favor (Hel)
8 new Odin's Path cards (Necronomicon, Destruction, Sheep Storm, and Zap Trap)
2 new end-game bonuses
5 new Missions